Whatever hover not working IE6 and IE7

Question

Below is the css for my menu

#menu
{
 position: absolute;
 left: 170px;
 top: 92px;
 background: #336699;
 float: left;
 z-index:50;
}

#menu ul
{
 list-style: none;
 margin: 0;
 padding: 0;
 width: 9em;
 float: left;
}

#menu a, #menu h2
{
 font: bold 11px/20px arial, helvetica, sans-serif;
 display: block;
 border-top-width: 1px;
 border-bottom-width: 1px;
 border-left-width: 1px;
 border-right-width: 1px;
 border-style: solid;
 border-color: #ccc #888 #555 #bbb;
 margin: 0;
 padding: 4px 3px;
}

#menu h2
{
 color: #fff;
 background: #336699;
 text-transform: uppercase;
 border-top-width: 0px;
 border-bottom-width: 0px;
 border-left-width: 1px;
 border-right-width: 1px;
}

#menu a
{
 color: #fff;
 background: #79A3CF;
 text-decoration: none;
}

#menu a:hover
{
 color: #a00;
 background: #fff;
}

#menu li
{
 position: relative;
}

#menu li ul li
{
 position: relative;
 width: 12em;
}

#menu ul ul
{
 position: absolute;
 z-index: 500;
}

#menu ul ul ul
{
 position: absolute;
 top: 0;
 left: 100%;
}

div#menu ul ul, div#menu ul li:hover ul ul, div#menu ul ul li:hover ul ul
{
 display: none;
}



div#menu ul li:hover ul, div#menu ul ul li:hover ul, div#menu ul ul ul li:hover ul
{
 display: block;
}

---

Here is my html design for the menu. It is a horizontal menu with dropdown submenus

<div id="menu">
    <ul>
      <li><h2>Computers</h2>
        <ul>
             <li>subitem
                  <ul><li>subitems</li>
             </li>
             <li>submitem</li>
             <li>submitem</li>
      </li>
     <li><h2>Network</h2>
                 <ul><li>subitems</li>
     </li>
    </ul>
</div>

---

I am using the minified version of the whatever hover script. Checked few posts here on this issue but couldn't solve the problem. The submenus are not appearing on IE6 and IE7. I trid adding

<!--[if lt IE 8]>

but no results...

Answer 1

Your HTML is poorly formed. ** indicates additions.

<div id="menu">
    <ul>
      <li><h2>Computers</h2>
        <ul>
             <li>subitem
                  <ul><li>subitems</li>**</ul>**
             </li>
             <li>submitem</li>
             <li>submitem</li>
     **</ul>**
      </li>

     <li><h2>Network</h2>
                 <ul><li>subitems</li>**</ul>**
     </li>
    </ul>
</div>

Answer 2

One good way to check for poorly formed html and other html problems is to validate your html in the w3c validator here.By using the validator to make sure my html is compliant, I can usually weed out browser discrepancies issues pretty easily.